FE 0.5.0

• Arena improvements
• bug fix in location tracking if Lexer lookahead was > 1

FE 0.4.1

• typo
• removed FE_INSTALL_DEPENDENCIES

FE 0.4.0

• std::format can now be substituted with fmtlib.
  This is useful if your C++ compiler does not yet have support for std::format. See #2.
• Parser::accept does now just return a Tok instead of a std::optional<Tok>.
  Parser::accept and Parser::expect indicate failure by constructing a Token with its default constructor. Provide a conversion operator to bool to check for an error:

  class Tok {
  public:
      enum class Tag {
          Nil,
          // ...
      };
      // ...
      explicit bool operator() const { return tag_ != Tag::Nil; }
      // ...
  };
   
  // Your Parser:
  if (auto tok = accept(Tok::Tag:My_Tag)) {
      do_sth(tok);
  }

  This is slightly more verbose as you have to add sth like a Nil tag, add a default constructor that initializes the tag with Nil (what you probably need anyway), and add the the one-liner for the conversion to bool but is also more lightweight and slightly easier to use.

FE 0.3.0

• UTF-8/char32_t-safe wrappers for <ctype> functions
• more convenience functions in the style of <ctype>-functions
• minor bug fixes and refactoring

FE 0.2.1

Just some minor updates

FE 0.2.0

This includes a short string optimization: A string will not be hashed into the SymPool if it it completely fits inside of a Sym. On your typical 64 bit machine that means that strings <= 6 characters + \0 will be kept "inline".

FE 0.1.1

Just a few bug fixes over 0.1.

FE 0.1

Initial Release.

Features

• Arena allocator for efficient memory management.
• Efficient symbol pool with optional Abseil support.
  String comparisons are now only pointer comparisons!
• Keep track of source code locations.
• Blueprint for a lexer with UTF-8.
• Blueprint for a parser.
• You need at least C++-20.